Datasheet

LTC3521
5
3521fb
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Switching Frequency
vs Temperature
Buck-Boost Feedback Voltage
vs Temperature
Typical perForMance characTerisTics
Buck Feedback Voltage
vs Temperature
Buck-Boost Maximum Load Current
vs V
IN
, Burst Mode Operation
Buck-Boost Switches R
DS(ON)
vs Temperature
Buck Switches R
DS(ON)
vs Temperature
Switching Frequency vs V
IN
T
A
= 25°C, unless otherwise noted.
Burst Mode Quiescent Current
vs V
IN
TEMPERATURE (°C)
–40
R
DS(ON)
(mΩ)
120
140
100
100
80
0 40
–20
20 60
120
80
20
0
60
160
40
3521 G05
PMOS
(SWITCHES A AND D)
NMOS
(SWITCHES B AND C)
V
IN
= 3.6V
V
OUT1
= 3.3V
TEMPERATURE (°C)
–40
R
DS(ON)
(mΩ)
300
100
250
200
0 40
–20
20 60
120
80
50
0
150
350
100
3521 G06
PMOS
NMOS
V
IN
= 3.6V
TEMPERATURE (°C)
–50
–1.0
CHANGE FROM 25°C (%)
–0.8
–0.4
–0.2
0
1.0
0.4
–10
30
50
3521 G07
–0.6
0.6
0.8
0.2
–30 10
70
90
110
V
IN
(V)
1.8
CHANGE FROM V
IN
= 3.6V (%)
1.0
1.5
5.3
0.5
0
2.8 3.8
2.3
3.3 4.3 4.8
–1.5
–2.0
–0.5
2.0
–1.0
3521 G08
TEMPERATURE (°C)
–40
CHANGE IN FEEDBACK VOLTAGE FROM 25°C (%)
0.1
100
0
–0.1
0 40
–20
20 60
120
80
–0.4
–0.5
–0.2
0.2
–0.3
3521 G09
TEMPERATURE (°C)
CHANGE IN FEEDBACK VOLTAGE FROM 25°C (%)
–0.1
0
0.1
–0.2
–0.3
–0.4
–0.5
0.2
3521 G10
–50
–25 250 50 75 100 125
V
IN
(V)
1.8
QUIESCENT CURRENT (µA)
5.3
31
2.8 3.8
2.3
3.3 4.3 4.8
25
29
33
27
3521 G11
ALL THREE CONVERTERS ENABLED
V
IN
(V)
1.8
MAXIMUM LOAD CURRENT (mA)
60
70
80
5.3
50
40
2.8 3.8
2.3
3.3 4.3 4.8
10
0
30
90
20
3521 G12
V
OUT
= 3V
V
OUT
= 5V
Buck-Boost Maximum Load
Current vs V
IN
, PWM Mode
100
500
900
1300
300
700
1100
1500
V
IN
(V)
LOAD CURRENT (mA)
3521 G13
V
OUT
= 3.3V
L = 4.7µH
V
OUT
= 5V
1.8 5.3
2.8 3.8
2.3
3.3 4.3 4.8